US7971937B2 - Seat adjuster assembly - Google Patents

Seat adjuster assembly Download PDF

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Publication number
US7971937B2
US7971937B2 US12/372,519 US37251909A US7971937B2 US 7971937 B2 US7971937 B2 US 7971937B2 US 37251909 A US37251909 A US 37251909A US 7971937 B2 US7971937 B2 US 7971937B2
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Prior art keywords
spindle shaft
vehicle seat
washer
spur gear
seat part
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US12/372,519
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US20090206644A1 (en
Inventor
Yoshinori Ishii
Zhi Song WANG
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Johnson Electric International AG
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Johnson Electric SA
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Priority to US12/372,519 priority Critical patent/US7971937B2/en
Assigned to JOHNSON ELECTRIC S.A. reassignment JOHNSON ELECTRIC S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHII, YOSHINORI, WANG, ZHI SONG
Publication of US20090206644A1 publication Critical patent/US20090206644A1/en
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Assigned to Johnson Electric International AG reassignment Johnson Electric International AG MERGER (SEE DOCUMENT FOR DETAILS). Assignors: JOHNSON ELECTRIC S.A.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/1605—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the cinematic
    • B60N2/161—Rods
    • B60N2/1615—Parallelogram-like structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/0224—Non-manual adjustments, e.g. with electrical operation
    • B60N2/02246—Electric motors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/1635—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the drive mechanism
    • B60N2/164—Linear actuator, e.g. screw mechanism
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • H02K7/1163—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion
    • H02K7/1166—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion comprising worm and worm-wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/209—Arrangements for driving the actuator using worm gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms

Definitions

  • the present invention relates to a seat adjuster assembly and in particular to a motor assembly thereof.
  • an automobile usually has a seat adjuster assembly which comprises a motor driving a spindle shaft via a gearbox.
  • the spindle shaft has outer threads engaging with inner threads of a nut contained in a tube which in turn is connected to a linkage connected respectively to a vertically movable upper part of a vehicle seat and a non-vertically movable lower part of the vehicle seat to cause the seat to move up or down under the control of a passenger occupying that seat to obtain a comfortable position.
  • the lower part of the vehicle seat is usually slidingly mounted in guide rails fixed to the vehicle frame so that the seat can be positioned fore and aft.
  • the gearbox comprises a worm gear mounted on the output shaft of the motor and a spur gear meshing with the worm gear.
  • the spur gear is made of plastic and directly molded to the spindle shaft.
  • the plastic spur gear cannot withstand a large axial force by itself and is easily destroyed by a large axial force imposed on the spindle shaft, as would occur in the event of a crash or accident.
  • the main object of the present invention is to improve the design and structure of a seat adjuster assembly which can solve the above problems or which can reduce axial play in the motor sub-assembly.
  • the illustrated embodiments of the present invention have the beneficial effects of increasing the axial pull off force between the spur gear and the spindle shaft by using washers between the spur gear and the spindle shaft.
  • the present invention can greatly improve the security of the system in a simple manner.
  • the present invention provides a seat adjuster assembly for adjusting a vertically movable upper vehicle seat part relative to a non-vertically movable lower vehicle seat part
  • the seat adjuster assembly comprising: an electric motor comprising an output shaft with a worm gear positioned in a gearbox; a spindle shaft providing first threads; a spur gear fixed to the spindle shaft, the spur gear meshing with the worm gear; and a linkage system connected to the upper vehicle seat part and the lower vehicle seat part, the linkage system comprising a non-rotatable part providing second threads coacting with the first threads of the spindle shaft such that the linkage system positions vertically the upper vehicle seat part relative to the lower vehicle seat part in responsive to the position of the spindle shaft relative to the non-rotatable member of the linkage system, wherein at least one washer is provided on the spindle shaft and the spur gear is an over-molded gear embedding the at least one washer therein.
  • the non-rotatable member of the linkage system is a tube with a nut fixed thereto, the spindle shaft extending through the nut and into the tube, inner threads of the nut forming said second threads
  • the linkage system further comprises a first link pivoted to one edge of the upper vehicle seat part and the lower vehicle seat part, a second link pivoted to an opposite edge of the upper vehicle seat part and the lower vehicle seat part, and a hook link with one end thereof being pivoted to the first link and the other end thereof fixed to the tube, a housing of the gearbox being pivotably connected to the upper vehicle seat part.
  • the spindle shaft is provided with a neck part, and the at least one washer is provided on the neck part.
  • the at least one washer comprises a plurality of washers, the spur gear embedding the plurality of washers therein, each washer comprising an annular split ring with an opening for fitting the ring to the spindle shaft.
  • the openings of the plurality of washers are evenly distributed circumferentially.
  • the at least one washer comprises a single annular split ring with an opening defined between two ends of the ring, and the ring is pinched onto the spindle shaft.
  • the ring is plastically deformed to grip the spindle shaft and close the opening.
  • a slot is formed in an inner edge of the ring diagonally opposite the opening.
  • the at least one washer is made of steel and the spur gear is made of plastic.
  • a pair of leaf springs bears against the spur gear and a wall of the gearbox.
  • the present invention also provides a motor sub-assembly for a seat adjuster assembly, the motor sub-assembly comprising: an electric motor comprising an output shaft with a worm gear positioned in a gearbox; a spindle shaft providing first threads; a spur gear fixed to the spindle shaft, the spur gear meshing with the worm gear; and a non-rotatable member providing second threads coacting with the first threads of the spindle shaft such that the spindle shaft drives the non-rotatable member along the spindle shaft when the spindle shaft rotates, wherein at least one washer is provided on the spindle shaft and the spur gear is an over-molded gear embedding the at least one washer therein.
  • the non-rotatable member is a tube with a nut fixed thereto, the spindle shaft extending through the nut and into the tube, inner threads of the nut forming said second threads
  • the spindle shaft is provided with a neck part, and the at least one washer is provided on the neck part.
  • the at least one washer comprises a plurality of washers, the spur gear embedding the plurality of washers therein, each washer comprising an annular split ring with an opening for fitting the ring to the spindle shaft.
  • the openings of the plurality of washers are evenly distributed circumferentially.
  • the at least one washer comprises a single annular split ring with an opening defined between two ends of the ring, and the ring is pinched onto the spindle shaft.
  • the ring is plastically deformed to grip the spindle shaft and to narrow the opening.
  • a slot is formed in an inner edge of the ring diagonally opposite the opening.
  • the at least one washer is made of steel and the spur gear is made of plastic.
  • a pair of leaf springs bears against the spur gear and a wall of the gearbox.
  • the present invention also provides a seat adjuster assembly for adjusting a vertically movable upper vehicle seat part relative to a non-vertically movable lower vehicle seat part
  • the seat adjuster assembly comprising: an electric motor having an output shaft and a worm gear positioned in a gearbox; a spur gear meshing with the worm gear; a spindle shaft fixed to and driven by the spur gear, the spindle shaft having first threads; and a linkage system connected to the upper vehicle seat part and the lower vehicle seat part, the linkage system comprising a non-rotatable member having second threads engaging with the first threads of the spindle shaft such that the linkage system positions vertically the upper vehicle seat part in responsive to the position of the spindle shaft relative to the non-rotatable member, wherein two leaf springs are disposed within the gearbox and bear against the spur gear and a wall of the gearbox.
  • the non-rotatable member of the linkage system is a tube with a nut fixed thereto, the spindle shaft extends through the nut and into the tube, and inner threads of the nut form said second threads.
  • the linkage system comprises a first link pivoted to one edge of the upper vehicle seat part and the lower vehicle seat part, a second link pivoted to an opposite edge of the upper vehicle seat part and the lower vehicle seat part, and a hook link with one end thereof being pivoted to the first link and the other end thereof fixed to the tube, a housing of the gearbox being pivotably connected to said opposite edge of the upper vehicle seat part.
  • At least one washer is provided on the spindle shaft, the spur gear embedding the washers therein.
  • the at least one washer comprises a single annular split ring with an opening defined between two ends of the ring, and the ring is pinched onto the spindle shaft.
  • the at least one washer comprises a plurality of washers, the spur gear embedding the plurality of washers therein, each washer comprising an annular split ring with an opening for fitting the ring to the spindle shaft.
  • FIG. 1 shows the structural components involved in the assembly for lifting the seat and their relative juxtapositions when the seat has been shifted to its up position
  • FIG. 2 shows the structural components involved in the assembly for controlling the seat and their relative juxtapositions when the seat has been shifted to its down position
  • FIG. 3 illustrates how axial play of the motor can result in a little movement of the seat while the automobile is in motion, thereby imparting discomfort to the person occupying the seat;
  • FIG. 4 illustrates how a large force to the seat results in a large force to the motor shaft, up to 18 k Newton in event of an accident (crash);
  • FIG. 5 is an exploded view of the invention showing the assembly of parts related to the motor output shaft
  • FIG. 6 shows the parts shown in FIG. 5 assembled
  • FIG. 7 is a view through the gear box of the assembly shown in FIG. 6 ;
  • FIG. 8 is a diagrammatic view showing the output threaded shaft with a novel washer pinched onto the shaft at one end and integrated or embedded into an over-molded plastic gear;
  • FIG. 9 is a face view of the washer pinched onto the shaft
  • FIG. 10 is an edge view of the washer
  • FIG. 11 is a diagrammatic view of the output spindle shaft sub-assembly
  • FIG. 12 is an exploded view of the output spindle shaft sub-assembly
  • FIG. 13 is a diagrammatic view showing the huge force generated from the thread on the spindle shaft
  • FIG. 14 is a top view of the novel spring arrangement used to constrain axial movement of the spindle shaft
  • FIG. 15 is a face view of the spring
  • FIG. 16 is an edge view of the spring
  • FIG. 17 is a diagrammatic view showing the gearbox arrangement
  • FIG. 18 is a view similar to FIG. 17 with parts transparent to show details of the assembly within the gearbox;
  • FIG. 19 is a diagrammatic view showing the washer inside the over-molded plastic gear
  • FIG. 20 shows the washer pinched onto the shaft before being over-molded with the plastic gear
  • FIG. 21 is a perspective view of the washer before being pinched onto the shaft
  • FIG. 22 is a diagrammatic view of the overall assembly showing the spindle shaft fully withdrawn into the tube, corresponding to the seat down position;
  • FIG. 23 is a diagrammatic view of the overall assembly showing the spindle shaft fully extended from the tube, corresponding to the seat up position;
  • FIG. 24A is a side view of the shaft and washers in accordance with an alternative embodiment of the present invention.
  • FIG. 24B is a cross-sectional view of FIG. 24A taken along the line A-A.
  • FIG. 24C is a diagrammatic view showing the stacked washers of FIG. 3A ;
  • FIG. 25A is a diagrammatic view showing the spindle shaft and washers in accordance with another alternative embodiment of the present invention.
  • FIG. 25B is a diagrammatic view showing the stacked washers of FIG. 25A ;
  • FIG. 26A is a diagrammatic view showing the spindle shaft and washers in accordance with another further alternative embodiment of the present invention.
  • FIG. 26B is a diagrammatic view showing the stacked washers of FIG. 26A .
  • the present invention relates to a seat adjuster assembly for an automobile seat wherein a motor drives a spindle shaft via a gearbox.
  • the spindle shaft coacts with a nut contained in a tube which in turn is connected to a linkage connected to a vertically movable upper part of a vehicle seat and to a non-vertically movable lower part of the vehicle seat to cause the seat to move up or down under the control of a passenger occupying that seat to obtain a comfortable position.
  • the lower part of the seat is slidingly mounted in guide rails fixed to the vehicle frame so that the seat can be positioned fore and aft. This is a known concept of the prior art.
  • a link 1 is pivoted by pin 10 at one end to one edge of the vertically movable upper seat part 12 , the portion of the seat that the passenger occupies, and at its other end by pin 17 to one end of a hook-link 14 .
  • link 1 is pivoted to the non-vertically movable lower seat part or seat frame part 20 by pin 16 .
  • Seat part 20 is guided on rails (not shown) that are attached to the vehicle frame to enable the seat to be adjusted fore and aft in a known manner.
  • One end of a second link 2 is pivoted by pin 18 to the opposite edge of the upper seat part 12 with its other end pivoted to the non-vertically movable lower seat part by pin 22 .
  • the housing of the motor 30 and gearbox housing 32 is pivotably connected to the upper seat part 12 by a pin 19 to form a triangular linkage system.
  • Links 1 and 2 support the vertically movable upper seat part 12 on the non-vertically movable lower seat part 20 with a motor assembly interconnecting link 1 and the upper seat part 12 .
  • the seat height is determined.
  • FIGS. 5 to 7 The motor assembly for the seat adjuster is shown in FIGS. 5 to 7 .
  • FIG. 5 is an exploded view of the motor assembly
  • FIG. 6 is an assembled view
  • FIG. 7 is a partial sectional view of the gearbox.
  • the motor assembly comprises an electric motor 30 integrally mounted with a gearbox housing 32 .
  • the motor output shaft has a worm gear 70 that terminates inside the gearbox housing 32 .
  • a spur gear 33 meshes with the worm gear 70 inside the gearbox housing 32 .
  • Spur gear 33 is an over-molded plastic gear embedding at least one washer 46 provided on a necked portion of the spindle shaft 40 .
  • the over-molded gear 33 has axially projections at its hub that extend over the juxtaposed portions of the shaft 40 .
  • the spindle shaft 40 is mounted for relative movement within tube 34 to be described in greater detail hereinafter.
  • a bearing plate 36 fits into the gearbox housing 32 to receive the free end of the spindle shaft 40 .
  • a U-shaped spring sub-assembly 38 consisting of two springs, fits around the spindle shaft 40 , bears against a spacer plate 42 lying against the over-molded plastic spur gear 33 within the gearbox 32 .
  • the gearbox 32 has a cover 43 that is fixed with 4 self-tapping screws 44 .
  • the other end of tube 34 is fixed to the other end of the link 14 such that the tube 34 is non-rotatable when the spindle shaft 40 is rotated in the tube 34 .
  • FIG. 8 shows diagrammatically the mounting of the over-molded plastic gear 33 on the spindle shaft 40 .
  • a master steel ball 45 is fitted into the end of the spindle shaft 40 for measuring position. The steel ball also reduces contact friction between the end of the spindle shaft and the bearing plate 36 .
  • FIGS. 9 and 10 show the washer 46 that is provided on the spindle shaft 40 according to a first embodiment of the present invention.
  • a single washer 46 is pinched onto a necked portion of the spindle shaft to securely hold the washer in place during over-molding and to accept the axial loading of the spindle shaft.
  • the washer 46 is a disc made of steel and consists of an annular split ring 47 with an opening 49 defined between two ends of the ring 47 . Diametrically opposite the opening 49 is a slot 51 formed in the inner edge of the annular ring.
  • the washer 46 is assembled onto a neck part, slightly diameter reduced section, of the spindle shaft 40 , and then, the washer 46 is over-molded with the plastic gear 33 .
  • the shaft is moved through the opening until the shaft is located within the annulus of the split ring.
  • the washer is then squeezed or compressed to pinch the washer on to the shaft. In so doing the washer is plastically deformed so that the annulus grips the shaft and the opening is narrowed or closed.
  • the slot 51 assists in allowing the washer to be plastically deformed to be pinched onto the spindle shaft by reducing the force required and controlling the zone of deformation.
  • the washer is so shaped that after being pinched onto the spindle shaft, the outer surface is substantially circular and concentric with the spindle shaft. This provides a uniform surface for the over-molding of the spur gear 33 thus allowing a better quality of molding.
  • the narrowing or closing of the opening reduces the influence of the opening on the over-molded gear.
  • the washer 46 when pinched to the spindle 40 has an outer diameter that is almost concentric to the gear inner diameter and this keeps the gear dimension accurate. Washer 46 receives a huge axial force from the spindle threaded shaft 40 .
  • the plastic gear 33 cannot, by itself, withstand such a force. Because the washer is made of steel and acts like a bone inside the plastic gear 33 , the washer 46 with the over-molded gear 33 can receive a large axial force imposed on the spindle hook sub-assembly, and thus, the combination of the washer 46 and over-molded gear 33 is able to withstand the force.
  • FIGS. 11 and 12 show the spindle hook sub-assembly in greater detail.
  • the nut 60 is fixed within the tube 34 and engaged with the threads of the spindle shaft 40 .
  • FIG. 13 shows the assembled spindle hook sub-assembly and in particular, the flange 24 which is used to pivotably connect the motor and gearbox housing 32 to pin 19 .
  • a spacer plate 42 is fitted against the side of the over-molded plastic gear 33 and a pair of steel springs 38 is inserted around the spindle shaft 40 between the spacer plate 42 and the wall of the gearbox 32 , as shown in FIG. 5 .
  • the springs 38 are U-shaped as shown in FIGS. 14 to 16 and have a tensile strength of greater than 1200N/mm 2 .
  • the setting force requirement and the stress level on the burr-free springs 38 is very high, and therefore, it is necessary to use a pair of springs or a stack of springs.
  • a DC motor threaded driving spindle shaft 40 that engages with a nut 60 fixed in the tube 34 with the relative position of the shaft 40 and nut 60 determining seat height position produces a considerable force.
  • the stacked springs air of springs 38
  • the use of the stacked arrangement of springs 38 also protected against spring fatigue in the small packaging space inside the gearbox 32 .
  • the use of the stacked U-shaped leaf springs 38 had unexpectedly good results in the motor driving system for setting and maintaining the vehicle seat position.
  • the springs 38 were about 30 mm in height with a curvature of about 36 degrees giving a free height of about 2 mm, see FIG. 16 .
  • the springs were about 0.8 mm thick and the legs of the U were about 7.5 mm wide. The edges were beveled as shown in FIG. 15 .
  • the spring force achieved was greater than 100N when compressed into 1.5 mm from free height, thus greater than 50N per spring.
  • the springs 38 withstood both compression and flattening testing with tolerant deformation.
  • FIGS. 17 and 18 show in greater detail the assembled spindle shaft 40 within the gearbox 32 , illustrating the position of the leaf springs 38 between the gear 33 and the wall of the gearbox 32 .
  • the function of the leaf springs 38 is to cancel free axial movement of the motor spindle shaft 40 .
  • FIGS. 19 to 21 show in greater detail the washer 46 inside the over-molded gear 33 and the meshing of the plastic gear 33 with the worm gear 70 on the output shaft of the electric motor 30 .
  • FIG. 20 shows the washer 46 pinched onto the shaft 40 prior to over-molding of the plastic gear 33 . As can be seen, the opening has been narrowed so as to be substantially closed.
  • FIG. 21 shows the washer 46 prior to being pinched onto the shaft 40 .
  • FIGS. 22 and 23 show, respectively, the interaction of the assembly as the motor 30 rotates.
  • the motor 30 is operated to rotate the spindle shaft 40
  • the nut 60 together with the tube 34 moves along the shaft 40 to change the length between pin 17 and pin 19 .
  • the shaft 40 is shown totally within the tube 34 and the distance between pin 17 and pin 19 is the shortest, therefore, the seat is in the seat down position.
  • the shaft 40 is shown fully extended from the tube 34 and the distance between pin 17 and pin 19 is the greatest, therefore, the seat is in the seat up position.
  • FIGS. 24A , 24 B and 24 C A second embodiment is shown in FIGS. 24A , 24 B and 24 C, in which four washers 46 ′ are provided on the neck part of the spindle shaft 40 and the gear 33 is molded over the four washers 46 ′.
  • Each washer 46 ′ is a steel annular split ring 47 ′ with a U-shaped opening 49 ′ extending in radial direction thereof.
  • the opening 49 ′ has a semi-circular end configured for contacting the spindle shaft 40 .
  • the openings 49 ′ of the washers 46 ′ are distributed, preferably symmetrically, in the circumferential direction of the washers and the semi-circle ends of the openings 49 ′ are concentric with the shaft 40 .
  • the openings 49 ′ of each washer 46 ′ are closed by the rings or body portions of the other washers 46 ′ in the axial direction, which improves the anti-deforming capability of the washers 46 ′ greatly. It also provides the washers with a uniform outer circumference on which the spur gear is molded, to improve the quality of the molding.
  • FIGS. 25A and 25B A further embodiment of the present invention is shown in FIGS. 25A and 25B , in which two washers 46 ′ are provided on the neck part of the spindle shaft 40 and the gear 33 is molded over the two washers 46 ′.
  • the U-shaped openings 49 ′ of the washers 46 ′ are distributed, preferably at an angle of 180 degrees to each other.
  • FIGS. 26A and 26B Another embodiment of the present invention is shown in FIGS. 26A and 26B , in which three washers 46 ′ are provided on the neck part of the spindle shaft 40 and the gear 33 is molded over the three washers 46 ′.
  • the U-shaped openings 49 ′ of the washers 46 ′ are distributed, preferably at an angle of 120 degrees to each other.
  • the quantity of the washers 46 can be N, and the U-shaped openings 49 ′ of the washers 46 ′ are distributed at an angle of 360/N degrees to each other, wherein N is an integer larger than or equal to 1. Understandably, the greater N is, the greater axial force the combination of the washer 46 ′ and over-molded gear 33 is able to withstand.
  • the circumferential distribution of the openings may not be strictly uniform but it is desirable that no two openings are aligned in the axial direction.
US12/372,519 2008-02-14 2009-02-17 Seat adjuster assembly Active 2029-11-06 US7971937B2 (en)

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CN200810066076.9 2008-02-14
CN2008100660769A CN101509540B (zh) 2008-02-14 2008-02-14 动力传输装置
CN200810066076 2008-02-14
US3400008P 2008-03-05 2008-03-05
US12/372,519 US7971937B2 (en) 2008-02-14 2009-02-17 Seat adjuster assembly

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Cited By (84)

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US20100282008A1 (en) * 2008-01-12 2010-11-11 Martin Kahr Knudsen Linear actuator
US20110095584A1 (en) * 2009-10-28 2011-04-28 Imasen Electric Industrial Co., Ltd. Seat apparatus
US20130113247A1 (en) * 2010-05-19 2013-05-09 C. Rob. Hammerstein Gmbh & Co. Kg Adjustment device for motor vehicle seats, in particular height adjustment devices
US20130200665A1 (en) * 2010-03-17 2013-08-08 C. Rob. Hammerstein Gmbh & Co. Kg Adjusting device, in particular height or longitudinal adjusting device for motor vehicle seats
US8727374B1 (en) 2013-01-24 2014-05-20 Ford Global Technologies, Llc Vehicle seatback with side airbag deployment
US8905431B1 (en) 2013-09-24 2014-12-09 Ford Global Technologies, Llc Side airbag assembly for a vehicle seat
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